That is the question!
A number of people I know have been assumed to be proud just because the starch on their clothes make their shoulders look raised, and chest puffed (until they get wet in the rains!).
Jokes aside, nicely starched shirts makes you look smart and gives better fitting. But starching is your frenemy – because it makes ironing a little bit more difficult, and reduces the life span of your shirts. Which is why most professional (high end) dry cleaners never use them. Most can get your local “washer-man” to put in some stiffness to your shirt, or D-I-Y it with a number of available cold water Starch brands from the supermarket shelves.
If you want to get a mid-point of the sharp look, and also extend the life of your shirt, a great option is the spray starch. Ironing is not so difficult because the shirts are slightly damp when being ironed, and you can also control the quantity that gets to the seams, which are usually the first areas that long term usage of starch tends to damage